A tablet does everything an e-reader does, plus everything else. On paper the e-reader makes no sense. In practice people who read a lot own both, and there is a specific technical reason for that.
The screens work completely differently
A tablet has a backlit display. Light is generated behind the panel and shines out at your eyes. It is bright, fast and full colour.
An e-reader uses electronic ink. Millions of microcapsules containing black and white particles are moved by an electric charge to form the page, and the result is then reflective. You see it by ambient light, exactly as with paper.
Two consequences follow, and they are the entire argument.
Power is only used to change the page. A static page consumes nothing at all, which is why e-readers last weeks rather than hours.
It works in direct sunlight. More light makes it more readable, the opposite of a backlit screen, which is why tablets are unusable on a beach.
Is it better for your eyes?
Carefully: e-ink is more comfortable for long reading for most people, but the popular explanations are shakier than the experience.
The blue light story is weaker than commonly claimed. Evidence that screen light damages eyes is thin, and studies on blue-blocking filters have been largely unimpressive.
What is better supported is the effect on sleep. Bright light in the evening suppresses melatonin and delays sleep onset. An e-reader with the front light low emits far less, which is a real advantage for reading in bed.
The other genuine factor is that a reflective page has no flicker and no glare from a light source pointed at you, and many people find that less fatiguing over hours.
Note that modern e-readers do have a light. It is aimed across the surface from the edges rather than out at your eyes, which is why it feels different from a tablet at the same brightness.
The advantage nobody mentions
The strongest case for an e-reader is not the screen. It is that the device cannot do anything else.
There is no notification, no messaging app, no browser worth using, and nothing competing for your attention. People who switch from reading on a tablet to reading on an e-reader consistently report finishing more books, and it is usually this rather than eye comfort.
A single-purpose device is a feature, and it is one no tablet can offer.
Where the tablet wins
- Anything with colour or layout. Magazines, comics, cookbooks, textbooks with diagrams. Colour e-ink exists but is muted and lower resolution.
- Page turn speed. E-ink refreshes slowly, which is fine for linear reading and poor for flicking between references.
- PDFs. Fixed-layout documents on a six-inch e-reader mean squinting or scrolling. Tablets handle them properly.
- Everything else. Video, email, browsing, drawing, games.
How to decide
Buy an e-reader if you read novels regularly, read in bed or outdoors, and find yourself starting books on a tablet and not finishing them.
Buy a tablet if you read occasionally, read illustrated or technical material, or want one device rather than another thing to charge.
A sensible test costs nothing: install a reading app on the tablet you already own and read one full book on it. If you finish it happily, you do not need an e-reader. If you keep drifting into other apps, that is your answer, and it is about attention rather than hardware.
If you buy one
Get a model with a front light and adjustable warmth, which matters for evening reading. Waterproofing is worth having for baths and beaches. And check which bookshop the device is tied to, because e-reader ecosystems are largely closed and switching later means leaving your library behind.
Also check whether it supports EPUB and borrowing from public libraries. Many people buy an e-reader and only later discover their local library lends ebooks free, which changes the economics of the whole thing.
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